<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<title>今天星期几</title>
	</head>

	<body>
		<h2 id="day"></h2>
		<script>
			//从date对象返回一周的某一天
			var date = new Date().getDay();
			//获取<h2>元素对象
			var h2 = document.getElementById('day');
			var s = "今天星期";
			switch(date) {
				case 0:
					s += "天";
					break;
				case 1:
					s += "一";
					break;
				case 2:
					s += "二";
					break;
				case 3:
					s += "三";
					break;
				case 4:
					s += "四";
					break;
				case 5:
					s += "五";
					break;
				case 6:
					s += "六";
					break;

			}
			//设置元素显示内容
			h2.innerHTML = s;
		</script>

	</body>

</html>